Possible Group Membership Recon Through Whoami.EXE (via process_creation)

title: Possible Group Membership Recon Through Whoami.EXE (via process_creation)
id: 96d206b3-1f4a-51e8-a40d-e4edada5e254
status: stable
description: This rule detects the execution of whoami.exe with the /group command line flag to show group membership for the current user, account type, security identifiers (SID), and attributes.
references:
    - https://attack.mitre.org/techniques/T1033/
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/whoami
author: Huntrule Team
date: 2026-03-31
tags:
    - attack.discovery
    - attack.t1033
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\whoami.exe'
        - OriginalFileName: 'whoami.exe'
    selection_cli:
        CommandLine|contains:
            - ' /groups'
            - ' -groups'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium